There isn't a one stratefy to rule them all. If you want to be profitable you always have to adapt according to the market conditions!
but there are also times when old strategies work again, although at some point you'll have to revise your strategy again while adding the newer ones. as you've have said that it depends on the market conditions, and i still believe that some old patterns are still useful in todays trading style. still for one to become a seasoned trader, you still need to experience more trading patterns or should i say it is the culmination of your accumulated experience in trading.
Basically when the market is similar to that old time. If X strategy works when Y happens, then when Y happens again in the future that could mean X can happen as well. This is why I believe that the best thing to do right now would be something that could benefit you the most, it could help you make as much profit as you could.
It is going to take a while before we could see that strategy work again, but if you check the market and check the strategy that works the best, and note that down then you can use it later when you see the market similar. Check the chart, see what worked and save it for later and you can compare all the notes you have taken and see if current time is similar to any of the past and if it is then you can try the strategy again.
Well here things can be very similar,it is Said that the market is based on patterns, the only thing is that and I do not believe in patterns or in chartist figures, but I can say that the market can give us many opportunities and that all of you are strategies that were used in the stock market in 1800-1900, and still work. The most important thing is that these Strategies apply to the Crypto Market and it is Incredible, but the maturity of a market can be felt as time Passes and passes and the Main facets such as accumulation and distribution are fulfilled.